The Cisco 4400 Series Wireless LAN Controller is designed for medium to large size facilities and is available in two models-the 4402 with two Gigabit Ethernet ports comes in configurations that support 12, 25, and 50 access points, and the 4404 with four Gigabit Ethernet ports supports 100 access points. The 4402 provides one expansion slot and the 4404 provides two expansion slots that can be used to add enhanced functionality in the future. In addition, each 4400 WLAN Controller supports an optional redundant power supply to ensure maximum availability.